LED trailers

Quote:

---

Originally Posted by CraigE

I think I might just put resistors on the trailer, much easier.

---

Just add the resisters into the trailer plug at the drawer bar side/within the plug itself.

Quote:

---

Originally Posted by imaz

Why must the load resisters be on the indicators and not all lights such has stop, tail/parking lights?

---

Because it's the indicator circuits which are probed for resistance indicating the presence of a trailer or not.

Quote:

---

Originally Posted by imaz

Why must the load resisters be on the indicators and not all lights such has stop, tail/parking lights?

---

Different vehicles need different things. The D3 (Also requires relays), D4 & I would assume RRS only check the indicator circuits, so no point in adding resistors to anything else.

If, for example, you had a BMW X6 you would need resistors and relays on both indicators, tail light and brake light circuits.

Quote:

---

Originally Posted by imaz

Just add the resisters into the trailer plug at the drawer bar side/within the plug itself.

---

You reckon you will be able to wire them within a standard trailer plug?

Each load resistors is about 5cm long x 1.2cm square and lets not talk about the possible need to mount them on a heat sink because they will heat if you activate and leave your hazard lights on with a trailer attached.

hmm, so my local auto mech added something to my RRS instead of the trailer. should I get this changed over?

Quote:

---

Originally Posted by Ferret

You reckon you will be able to wire them within a standard trailer plug?

Each load resistors is about 5cm long x 1.2cm square and lets not talk about the possible need to mount them on a heat sink because they will heat if you activate and leave your hazard lights on with a trailer attached.

---

This video used small resisters? But obviously she added more than we would need into the 7 flat.

LED trailer plug resistor wiring - YouTube

By the way, is there a minimum wattage resister which is sufficient to trick the D4? 25w would be hot to run if you can get by with a 10w resister instead? Might be simpler to add a incandescent turn indicators on the trailer(additional lights).

Quote:

---

Originally Posted by Eevo

hmm, so my local auto mech added something to my RRS instead of the trailer. should I get this changed over?

---

Is it switchable? Or is the trailer symbol constantly on?

Quote:

---

Originally Posted by imaz

By the way, is there a minimum wattage resister which is sufficient to trick the D4? 25w would be hot to run if you can get by with a 10w resister instead? Might be simpler to add a incandescent turn indicators on the trailer(additional lights).

---

It’s resistance that matters… ohms.
The watt rating is how much it can handle.
I use 50w normally.

Quote:

---

Originally Posted by imaz

This video used small resisters? But obviously she added more than we would need into the 7 flat.

LED trailer plug resistor wiring - YouTube

---

She used 120 ohm resistors, which is about the equivalent of a 1.6 watt load at 14.5V. I’m not convinced that will work at all with a D4, and if it does probably won’t last long as they are only rated to 1 watt. But for $0.68 you won’t have lost much if it doesn’t work 120 Ohm 1 Watt Carbon Film Resistors - Pack of 2 | Jaycar Electronics